Thaiderces yangcong Li & Chang

Chang, Wan-Jin & Li, Shuqiang, 2019, Fourteen new species of the spider genus Thaiderces from Southeast Asia (Araneae, Psilodercidae), ZooKeys 869, pp. 103-146 : 103

publication ID	https://dx.doi.org/10.3897/zookeys.869.35546
publication LSID	lsid:zoobank.org:pub:AFF62E38-4FD4-4E5D-9D92-3EC97E4A4368
persistent identifier	https://treatment.plazi.org/id/12BF7080-7804-4552-BF98-3ADE137B13C4
taxon LSID	lsid:zoobank.org:act:12BF7080-7804-4552-BF98-3ADE137B13C4
treatment provided by	ZooKeys by Pensoft
scientific name	Thaiderces yangcong Li & Chang
status	sp. nov.

Treatment

Thaiderces yangcong Li & Chang sp. nov. Figs 1E View Figure 1 , 2L View Figure 2 , 11 View Figure 11 , 12 View Figure 12 , 27B View Figure 27 , 29 View Figure 29

Types.

Holotype: ♂ (IZCAS), Indonesia, Sumatra, Jambi Province, Kerinci, Talang Cindang, near river, 02°04.834'S, 101°22.448'E, 1054 m, 23.V.2014, Yao Z. Paratype: 1♀ (IZCAS), same data as holotype.

Etymology.

The species name is a noun in apposition derived from the Chinese pinyin yángcōng (onion) and refers to the entire structure of the bulb which resembles an onion bulb.

Diagnosis.

Thaiderces yangcong sp. nov. is similar to T. djojosudharmoi , but males can be distinguished by the thin and long embolus (vs. a thick and short embolus in T. djojosudharmoi ), a rather plump and rounded bulb (vs. a rather ovate bulb), and the presence of embolic stubble (vs. absence of embolic stubble); females can be distinguished by a pair of short, twisted, and rather distant wavy spermathecae (vs. two pairs of short petal-like spermathecae that are close together in T. djojosudharmoi ).

Description.

Male (holotype). Total length 1.95; carapace 0.70 long, 0.75 wide; abdomen 1.25 long, 0.90 wide. Carapace round and pale brown, with three longitudinal dark brown bands, median band only half the length of carapace, lateral bands three times wider than the middle band ( Fig. 11C View Figure 11 ). Chelicerae brown ( Fig. 27B View Figure 27 ). Clypeus dark brown medially and light brown laterally. Endites pale yellow. Labium light brown. Sternum with dark brown pattern. Abdomen elongated, dorsum with brown stripes medially ( Fig. 11C View Figure 11 ), anteroventrally brown with pair of dark brown circular patches followed by a light brown elliptical patch, posterior part with a pair of yellow dotted lines laterally and a V-shaped mark medially. Legs uniformly brown; measurements: I missing, II 5.15 (1.25, 0.16, 1.56, 1.40, 0.78), III 4.68 (1.25, 0.31, 1.25, 1.25, 0.62), IV 6.32 (1.56, 0.25, 1.87, 1.71, 0.93). Palp ( Fig. 12 A–D View Figure 12 ): femur four times longer than patella; patella not swollen, tibia 2/3 the length of femur; cymbium darker anteriorly, half the length of femur; bulb light yellow, round with sparse embolic stubble; embolus thin and dark, arising distally, almost the same length as bulb ( Fig. 12A View Figure 12 ).

Female (paratype). General features and coloration similar to that of male ( Fig. 11 D–E View Figure 11 ). Measurements: total length 1.62; carapace 0.62 long, 0.70 wide; abdomen 1.00 long, 0.70 wide. Leg measurements: I 5.39 (1.40, 0.25, 1.56, 1.40, 0.78), II 5.50 (1.00, 0.25, 1.25, 1.13, 1.12, 0.75), III 3.72 (0.87, 0.25, 1.00, 1.00, 0.60), IV 5.42 (1.37, 0.25, 1.60, 1.40, 0.80). Endogyne: a pair of short, twisted, and paired coiled spermathecae, ratio of spermathecae interdistance and spermatheca width 1: 5 ( Fig. 11A View Figure 11 ).

Distribution.

Known only from the type locality ( Fig. 29 View Figure 29 ).